Do you already own a 42" Keystone Premium Fireplace, but your want to switch to using propane fuel instead of natural gas? If so, then this handy conversion kit is the perfect solution for your dilemma! This product makes changing your fireplace fuel source simple and easy. The kit is designed for use exclusively with the 42" Keystone Premium fireplaces with millivolt controls. Don't even consider switching out your fireplace! Choose the economical option and change your fuel source without changing your fireplace.